@angular/forms
Version:
Angular - directives and services for creating forms
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JavaScript
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { Directive, ElementRef, forwardRef, Injectable, Injector, Input, Renderer2 } from '@angular/core';
import { NG_VALUE_ACCESSOR } from './control_value_accessor';
import { NgControl } from './ng_control';
export const RADIO_VALUE_ACCESSOR = {
provide: NG_VALUE_ACCESSOR,
useExisting: forwardRef(() => RadioControlValueAccessor),
multi: true
};
/**
* @description
* Class used by Angular to track radio buttons. For internal use only.
*/
export class RadioControlRegistry {
constructor() {
this._accessors = [];
}
/**
* @description
* Adds a control to the internal registry. For internal use only.
*/
add(control, accessor) {
this._accessors.push([control, accessor]);
}
/**
* @description
* Removes a control from the internal registry. For internal use only.
*/
remove(accessor) {
for (let i = this._accessors.length - 1; i >= 0; --i) {
if (this._accessors[i][1] === accessor) {
this._accessors.splice(i, 1);
return;
}
}
}
/**
* @description
* Selects a radio button. For internal use only.
*/
select(accessor) {
this._accessors.forEach((c) => {
if (this._isSameGroup(c, accessor) && c[1] !== accessor) {
c[1].fireUncheck(accessor.value);
}
});
}
_isSameGroup(controlPair, accessor) {
if (!controlPair[0].control)
return false;
return controlPair[0]._parent === accessor._control._parent &&
controlPair[1].name === accessor.name;
}
}
RadioControlRegistry.decorators = [
{ type: Injectable }
];
/**
* @description
* The `ControlValueAccessor` for writing radio control values and listening to radio control
* changes. The value accessor is used by the `FormControlDirective`, `FormControlName`, and
* `NgModel` directives.
*
* @usageNotes
*
* ### Using radio buttons with reactive form directives
*
* The follow example shows how to use radio buttons in a reactive form. When using radio buttons in
* a reactive form, radio buttons in the same group should have the same `formControlName`.
* Providing a `name` attribute is optional.
*
* {@example forms/ts/reactiveRadioButtons/reactive_radio_button_example.ts region='Reactive'}
*
* @ngModule ReactiveFormsModule
* @ngModule FormsModule
* @publicApi
*/
export class RadioControlValueAccessor {
constructor(_renderer, _elementRef, _registry, _injector) {
this._renderer = _renderer;
this._elementRef = _elementRef;
this._registry = _registry;
this._injector = _injector;
/**
* @description
* The registered callback function called when a change event occurs on the input element.
*/
this.onChange = () => { };
/**
* @description
* The registered callback function called when a blur event occurs on the input element.
*/
this.onTouched = () => { };
}
/**
* @description
* A lifecycle method called when the directive is initialized. For internal use only.
*/
ngOnInit() {
this._control = this._injector.get(NgControl);
this._checkName();
this._registry.add(this._control, this);
}
/**
* @description
* Lifecycle method called before the directive's instance is destroyed. For internal use only.
*/
ngOnDestroy() {
this._registry.remove(this);
}
/**
* @description
* Sets the "checked" property value on the radio input element.
*
* @param value The checked value
*/
writeValue(value) {
this._state = value === this.value;
this._renderer.setProperty(this._elementRef.nativeElement, 'checked', this._state);
}
/**
* @description
* Registers a function called when the control value changes.
*
* @param fn The callback function
*/
registerOnChange(fn) {
this._fn = fn;
this.onChange = () => {
fn(this.value);
this._registry.select(this);
};
}
/**
* Sets the "value" on the radio input element and unchecks it.
*
* @param value
*/
fireUncheck(value) {
this.writeValue(value);
}
/**
* @description
* Registers a function called when the control is touched.
*
* @param fn The callback function
*/
registerOnTouched(fn) {
this.onTouched = fn;
}
/**
* Sets the "disabled" property on the input element.
*
* @param isDisabled The disabled value
*/
setDisabledState(isDisabled) {
this._renderer.setProperty(this._elementRef.nativeElement, 'disabled', isDisabled);
}
_checkName() {
if (this.name && this.formControlName && this.name !== this.formControlName) {
this._throwNameError();
}
if (!this.name && this.formControlName)
this.name = this.formControlName;
}
_throwNameError() {
throw new Error(`
If you define both a name and a formControlName attribute on your radio button, their values
must match. Ex: <input type="radio" formControlName="food" name="food">
`);
}
}
RadioControlValueAccessor.decorators = [
{ type: Directive, args: [{
selector: 'input[type=radio][formControlName],input[type=radio][formControl],input[type=radio][ngModel]',
host: { '(change)': 'onChange()', '(blur)': 'onTouched()' },
providers: [RADIO_VALUE_ACCESSOR]
},] }
];
RadioControlValueAccessor.ctorParameters = () => [
{ type: Renderer2 },
{ type: ElementRef },
{ type: RadioControlRegistry },
{ type: Injector }
];
RadioControlValueAccessor.propDecorators = {
name: [{ type: Input }],
formControlName: [{ type: Input }],
value: [{ type: Input }]
};
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For internal use only.\n */\n@Injectable()\nexport class RadioControlRegistry {\n  private _accessors: any[] = [];\n\n  /**\n   * @description\n   * Adds a control to the internal registry. For internal use only.\n   */\n  add(control: NgControl, accessor: RadioControlValueAccessor) {\n    this._accessors.push([control, accessor]);\n  }\n\n  /**\n   * @description\n   * Removes a control from the internal registry. For internal use only.\n   */\n  remove(accessor: RadioControlValueAccessor) {\n    for (let i = this._accessors.length - 1; i >= 0; --i) {\n      if (this._accessors[i][1] === accessor) {\n        this._accessors.splice(i, 1);\n        return;\n      }\n    }\n  }\n\n  /**\n   * @description\n   * Selects a radio button. For internal use only.\n   */\n  select(accessor: RadioControlValueAccessor) {\n    this._accessors.forEach((c) => {\n      if (this._isSameGroup(c, accessor) && c[1] !== accessor) {\n        c[1].fireUncheck(accessor.value);\n      }\n    });\n  }\n\n  private _isSameGroup(\n      controlPair: [NgControl, RadioControlValueAccessor],\n      accessor: RadioControlValueAccessor): boolean {\n    if (!controlPair[0].control) return false;\n    return controlPair[0]._parent === accessor._control._parent &&\n        controlPair[1].name === accessor.name;\n  }\n}\n\n/**\n * @description\n * The `ControlValueAccessor` for writing radio control values and listening to radio control\n * changes. The value accessor is used by the `FormControlDirective`, `FormControlName`, and\n * `NgModel` directives.\n *\n * @usageNotes\n *\n * ### Using radio buttons with reactive form directives\n *\n * The follow example shows how to use radio buttons in a reactive form. When using radio buttons in\n * a reactive form, radio buttons in the same group should have the same `formControlName`.\n * Providing a `name` attribute is optional.\n *\n * {@example forms/ts/reactiveRadioButtons/reactive_radio_button_example.ts region='Reactive'}\n *\n * @ngModule ReactiveFormsModule\n * @ngModule FormsModule\n * @publicApi\n */\n@Directive({\n  selector:\n      'input[type=radio][formControlName],input[type=radio][formControl],input[type=radio][ngModel]',\n  host: {'(change)': 'onChange()', '(blur)': 'onTouched()'},\n  providers: [RADIO_VALUE_ACCESSOR]\n})\nexport class RadioControlValueAccessor implements ControlValueAccessor, OnDestroy, OnInit {\n  /** @internal */\n  // TODO(issue/24571): remove '!'.\n  _state!: boolean;\n  /** @internal */\n  // TODO(issue/24571): remove '!'.\n  _control!: NgControl;\n  /** @internal */\n  // TODO(issue/24571): remove '!'.\n  _fn!: Function;\n\n  /**\n   * @description\n   * The registered callback function called when a change event occurs on the input element.\n   */\n  onChange = () => {};\n\n  /**\n   * @description\n   * The registered callback function called when a blur event occurs on the input element.\n   */\n  onTouched = () => {};\n\n  /**\n   * @description\n   * Tracks the name of the radio input element.\n   */\n  // TODO(issue/24571): remove '!'.\n  @Input() name!: string;\n\n  /**\n   * @description\n   * Tracks the name of the `FormControl` bound to the directive. The name corresponds\n   * to a key in the parent `FormGroup` or `FormArray`.\n   */\n  // TODO(issue/24571): remove '!'.\n  @Input() formControlName!: string;\n\n  /**\n   * @description\n   * Tracks the value of the radio input element\n   */\n  @Input() value: any;\n\n  constructor(\n      private _renderer: Renderer2, private _elementRef: ElementRef,\n      private _registry: RadioControlRegistry, private _injector: Injector) {}\n\n  /**\n   * @description\n   * A lifecycle method called when the directive is initialized. For internal use only.\n   */\n  ngOnInit(): void {\n    this._control = this._injector.get(NgControl);\n    this._checkName();\n    this._registry.add(this._control, this);\n  }\n\n  /**\n   * @description\n   * Lifecycle method called before the directive's instance is destroyed. For internal use only.\n   */\n  ngOnDestroy(): void {\n    this._registry.remove(this);\n  }\n\n  /**\n   * @description\n   * Sets the \"checked\" property value on the radio input element.\n   *\n   * @param value The checked value\n   */\n  writeValue(value: any): void {\n    this._state = value === this.value;\n    this._renderer.setProperty(this._elementRef.nativeElement, 'checked', this._state);\n  }\n\n  /**\n   * @description\n   * Registers a function called when the control value changes.\n   *\n   * @param fn The callback function\n   */\n  registerOnChange(fn: (_: any) => {}): void {\n    this._fn = fn;\n    this.onChange = () => {\n      fn(this.value);\n      this._registry.select(this);\n    };\n  }\n\n  /**\n   * Sets the \"value\" on the radio input element and unchecks it.\n   *\n   * @param value\n   */\n  fireUncheck(value: any): void {\n    this.writeValue(value);\n  }\n\n  /**\n   * @description\n   * Registers a function called when the control is touched.\n   *\n   * @param fn The callback function\n   */\n  registerOnTouched(fn: () => {}): void {\n    this.onTouched = fn;\n  }\n\n  /**\n   * Sets the \"disabled\" property on the input element.\n   *\n   * @param isDisabled The disabled value\n   */\n  setDisabledState(isDisabled: boolean): void {\n    this._renderer.setProperty(this._elementRef.nativeElement, 'disabled', isDisabled);\n  }\n\n  private _checkName(): void {\n    if (this.name && this.formControlName && this.name !== this.formControlName) {\n      this._throwNameError();\n    }\n    if (!this.name && this.formControlName) this.name = this.formControlName;\n  }\n\n  private _throwNameError(): void {\n    throw new Error(`\n      If you define both a name and a formControlName attribute on your radio button, their values\n      must match. Ex: <input type=\"radio\" formControlName=\"food\" name=\"food\">\n    `);\n  }\n}\n"]}